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Blockchain Software Engineer – Crypto Custody Platform

dmgblockchain · Delta

Nouveau
🇬🇧 English
TypeScript Node.js NestJS Next.js PostgreSQL relational databases authentication authorization secure API design EVM ERC-20 JSON-RPC MPC HSM queues idempotency transactional outbox

Description du poste

About the role

We are building a financial‑technology platform that lets institutional customers manage fiat accounts, transactional wallets and digital‑asset custody wallets. We need a backend‑focused Software Engineer with blockchain expertise to work across our existing web application and help create the next generation of our custody infrastructure.

Key responsibilities

  • Develop and maintain features in our NestJS API, Next.js portal and supporting services.
  • Design provider‑neutral custody workflows and evolve transaction systems toward immutable, policy‑controlled intents.
  • Implement approval workflows, segregation of duties, transaction limits and destination policies.
  • Build key‑set, wallet‑address and lifecycle management, integrating secure MPC, HSM or confidential‑computing components.
  • Expand blockchain support across EVM networks and eventually Bitcoin and Solana.
  • Improve Harbor, our blockchain observation and reconciliation service, and integrate providers such as QuickNode.
  • Handle deposits, withdrawals, confirmations, finality, failed transactions and blockchain reorganisations.
  • Design reliable asynchronous workflows using queues, idempotency and transactional outbox patterns.

Required profile

  • Approximately 4+ years of professional software engineering experience or equivalent impact.
  • Strong communication skills with the ability to explain technical trade‑offs clearly.

Required skills

  • TypeScript and Node.js (NestJS, Next.js).
  • PostgreSQL and relational database design, migrations and transactions.
  • Authentication, authorization, role‑based access control and secure API design.
  • Automated testing (unit, integration, end‑to‑end) for business‑critical workflows.
  • Understanding of production blockchain systems: wallet addresses, transaction construction, signing, broadcasting, confirmations and reorganisations.
  • Experience with EVM networks, ERC‑20 token transfers, JSON‑RPC APIs and blockchain indexing.

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